assurance：保证，担保，确信，把握，信心

词根词缀：as-来,临近 + -sur-确信 + -ance

• refresh
• refreshing
• refreshment
• refrigerant
• refrigerate
• refrigeration
• refrigerator
• refrigeratory
• refuel
• refuge
• refugee
• refulgent
• refund
• refurbish
• refusal
• refuse
• refusenik
• refute
• regain
• regal
• regale
• regalia
• regard
• regarding
• regardless